Thomas Joseph Williams, more commonly known as Tom Williams, (; 12 May 1923–2 September 1942) was a volunteer in C Company, 2nd Battalion of the Belfast Brigade in the Irish Republican Army from the Bombay Street area of Belfast, Northern Ireland. He was hanged in the Crumlin Road Gaol for his involvement in the murder of Royal Ulster Constabulary (RUC) police officer named Patrick Murphy during the Northern Campaign.